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threshold and the vertical plane containing the primary runway centre line.
x) Secondary runway threshold Z coordinate shall represent the height of the secondary runway threshold above the MLS
datum point.
y) Secondary runway threshold crossing height shall represent the height above the secondary runway threshold at which
the computed glide path crosses the threshold.
z) Virtual azimuth to secondary runway threshold distance shall represent the distance to the secondary runway threshold
from the point to be considered as the origin for lateral guidance to that runway.
Note.— This distance may be used by the MLS receiver in a manner similar to the approach azimuth antenna to
threshold distance, to establish the lateral deviation scale factor.
APP A-11 23/11/06
Annex 10 — Aeronautical Communications Volume I
Table A-12. Auxiliary data B
(see 3.11.4.8.3)
Word Data content
Type of
data
Maximum time
between
transmissions
(seconds)
Bits
used
Bits
used
Least
significant
bit
Bit
number
Words B1 through B39: Time-invariant (fixed) data items supporting MLS/RNAV procedures (see Table A-15)
Words B40 through B54: Other fixed data items
B40 PREAMBLE digital 2.0 12 see Note 6 I1 - I12
Address 8 I13 - I20
Latitude of MLS datum point 23 –324 000.0 arc seconds
to +324 000.0 arc
seconds
(see Note 2)
0.1 arc
seconds
I21 - I43
Longitude of MLS datum point 24 –648 000.0 arc seconds
to +648 000.0 arc
seconds
(see Note 2)
0.1 arc
seconds
I44 - I67
SPARE 2 see Note 9 I68 - I69
PARITY 7 see Note 1 I70 - I76
B41 PREAMBLE digital 2.0 12 see Note 6 I1 - I12
Address 8 I13 -I20
Vertical coordinate of MLS
datum point
13 –4 095 m to +4 095 m
(see Note 2)
1 m I21 - I33
Approach azimuth True North
orientation
16 0° to 359.99° 0.01° I34 - I45
SPARE 20 I50 - I69
PARITY 7 see Note 1 I70 - I76
B42 PREAMBLE (see Note 5) digital 1.0 12 see Note 6 I1 - I12
Address 8 I13 - I20
Approach azimuth antenna offset 10 –511 m to +511 m
(see Note 2)
1 m I21 - I30
Approach azimuth antenna to
MLS datum point distance
13 0 m to 8 191 m 1 m I31 - I43
Approach azimuth alignment with
runway centre line
14 –81.91° to +81.91°
(see Note 2)
0.01° I44 - I67
Approach azimuth antenna height 7 –63 m to +63 m
(see Note 2)
1 m I58 - I64
SPARE 5 see Note 9 I65 - I69
23/11/06 APP A-12
Appendix A Annex 10 — Aeronautical Communications
Word Data content
Type of
data
Maximum time
between
transmissions
(seconds)
Bits
used
Bits
used
Least
significant
bit
Bit
number
PARITY 7 see Note 1 I70 - I76
B43 PREAMBLE (see Notes 4 and 5) digital 1.0 12 see Note 6 I1 - I12
Address 8 I13 - I20
Back azimuth antenna offset 10 –511 m to +511 m
(see Note 2)
1 m I21 - I30
Back azimuth antenna to MLS
datum point distance
11 0 m to 2 047 m 1 m I31 - I41
Back azimuth alignment with
runway centre line
14 –81.91° to +81.91°
(see Note 2)
0.01° I42 - I55
Back azimuth antenna height 7 –63 m to +63 m
(see Note 2)
1 m I56 - I62
SPARE 7 see Note 9 I63 - I69
PARITY 7 see Note 1 I70 - I76
B44 PREAMBLE digital 2.0 12 see Note 6 I1 - I12
Address 8 I13 - I20
Primary runway number 6 0 to 36
(see Note 10)
I21 - I26
Primary runway letter 2 see Note 7 I27 - I28
Secondary runway number 6 0 to 36
(see Note 10)
I29 - I34
Secondary runway letter 2 see Note 7 I35 - I36
Elevation guidance to
secondary runway
2 see Note 8 I37 - I38
Minimum glide path to
secondary runway
7 2° to 14.7° 0.1° I39 - I45
Approach azimuth alignment with
secondary runway centre line
16 ±180.00° 0.01° I46 - I61
SPARE 8 see Note 9 I62 - I69
PARITY 7 see Note 1 I70 - I76
B45 PREAMBLE digital 2.0 12 see Note 6 I1 - I12
Address 8 I13 - I20
Secondary runway threshold
X coordinate
15 ±16 384 m 1 m I21 - I35
Secondary runway threshold
Y coordinate
15 ±16 384 m 1 m I36- I50
APP A-13 23/11/06
Annex 10 — Aeronautical Communications Volume I
23/11/06 APP A-14
Word Data content
Type of
data
Maximum time
between
transmissions
(seconds)
Bits
used
Bits
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